Add merge function to replace two atoms by one

[pmrv]

No description provided.

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[jan-janssen]

Looks good to me

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.19%. Comparing base (41d549e) to head (923299b).

Additional details and impacted files

@@             Coverage Diff             @@
##           repulse     #481      +/-   ##
===========================================
+ Coverage    83.04%   83.19%   +0.15%     
===========================================
  Files           27       27              
  Lines         1887     1904      +17     
===========================================
+ Hits          1567     1584      +17     
  Misses         320      320              

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